From “Crypts of the Dead Gods” by Axton Wales

The Astral Plane is where gods go to die, and where the great physical forms of dead gods rest. One group believes that these deities must be mourned, interred, and remembered–and for that purpose they laboriously constructed the Crypts of the Dead Gods out of the flecks of solid matter amid the Astral.

The Cryptkeepers, as they are known, believe that once a portion of each god that has ever perished is entombed in the Crypt, that they will then be allowed to ascend as gods themselves, each taking the place of one of the fallen deities. Each tomb contains a portion of a dead god from the Astral–normally not more than a small chunk–and, if possible, at least one mortal who worshiped them in life. Each mortal is carefully stripped of their worldly possessions and mummified.

To help in their cause, the Cryptkeepers also entomb others who die in the Astral. They accept payment in gold for anyone wishing to be buried in solid matter, rather than the formless void, and ship off whatever possessions come into their hands to the various transplanar wholesalers that do business in that sort of thing.

A key facet of the Cryptkeeper burials is that they are not unlimited. Space is at a premium and the most lavish tombs are reserved for the god-chunks that have been obtained. As such, the internments are a 100-year rental only, by the reckoning of the great clock in the center of the complex. After 100 years, the rental must be renewed and repaid in full. Otherwise, the corpses are raised to “earn their keep” as undead before being cast into a communal pit to extend the size of the Cryptkeepers’ island. 100 years of undead servitude, assuming that the reanimated last that long, is enough to purchase another 100 years of rest.